Restrict a table to a single record

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QUESTION
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I use a table called Parms in my database to store application specific parameters.
If a user accidentally added a record to this table, instead of simply editing the single record containing the appropriate values, it would cause major issues for the application.

Is there a way to restrict a table to contain only a SINGLE record in Microsoft Access?

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ANSWER
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Use a required field, like the Primary Key (but DO NOT set to AutoNumber)
Set it to:
Default Value: 1
Validation Rule: =1
Required: Yes
Indexed: Yes (No Duplicates)

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EXAMPLES
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APPLIES TO / KEY WORDS
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Microsoft Access
Unique Records
Limit to a single record
Limit a table

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REF
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http://social.msdn.microsoft.com/Forums/en-US/accessdev/thread/4c5b29f6-15cd-4dab-858a-57c90569b97c/

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http://www.anysitesupport.com/restrict-a-table-to-a-single-record/
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